On Mon, 2017-10-16 at 21:27 +0100, Chris Wilson wrote:
> When pwriting into shmemfs, the fast path pagecache_write does not
> notice when it is writing to beyond the end of the truncated shmemfs
> inode. Report -EFAULT directly when we try to use pwrite into the
> !I915_MADV_WILLNEED object.
>
> Fixes: 7c55e2c5772d ("drm/i915: Use pagecache write to prepopulate shmemfs from pwrite-ioctl")
> Testcase: igt/gem_madvise/dontneed-before-pwrite
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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